package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.pojo.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

/**
 * Created by ZhaoJun on 2021/11/21 21:08
 */
@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

        //强转成子类功能比较多
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        log.info("拦截到请求：{}", request.getRequestURI());

        //定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/upload/**",
                "/download/**",
                "/user/**",
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"
        };

        //A. 获取本次请求的URI
        String uri = request.getRequestURI();

        //B. 判断本次请求, 是否需要登录, 才可以访问


        if (check(urls,uri)) {
            //C. 如果不需要，则直接放行
            filterChain.doFilter(request, response);
            return;
        }
        //D. 判断登录状态，如果已登录，则直接放行
        HttpSession session = request.getSession();
        Long empId = (Long) session.getAttribute("employee");
        Long userId = (Long) session.getAttribute("userId");
        System.out.println("========");
        System.out.println("过滤器--userId:"+userId);
        System.out.println("过滤器--empId:"+empId);


        if (empId != null) {
            log.info("放行请求：{}", request.getRequestURI());
            BaseContext.setCurrentId(empId);
            filterChain.doFilter(request, response);
            return;
        }

        if (userId != null) {
            int i = 0;
            log.info("放行请求：{}", request.getRequestURI());
            BaseContext.setCurrentId(userId);
            filterChain.doFilter(request, response);
            return;
        }

        //E. 如果未登录, 则返回未登录结果
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    public boolean check(String[] urls, String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                return true;
            }
        }
        return false;
    }
}
